自定义字段注解

自定义字段描述

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface FieldDescrib {
    String name();
    String desc() default "";
}

@Data
public class StudentDemo {
    @FieldDescrib(name = "学生的年纪", desc = "正常情况是1-100")
    private Integer age;
    @FieldDescrib(name = "学生的性别", desc = "0:未知 1:男 2:女")
    private Integer sex;
}

获取字段自定义注解

    @RequestMapping("/getAttrVals")
    public void getAttrVal() {
        StudentDemo StudentDemo = new StudentDemo();
        StudentDemo.setAge(20);
        StudentDemo.setSex(1);

        Field[] fields = StudentDemo.getClass().getDeclaredFields();

        String getFields = "";
        for (Field field : fields) {
            FieldDescrib declaredAnnotation = field.getDeclaredAnnotation(FieldDescrib.class);
            System.out.println(declaredAnnotation);
            getFields += "name:" + field.getName() + "=" + ModelToMap.getFieldValueByName(field.getName(), StudentDemo) + ",";
        }

        System.out.println(getFields.substring(0, getFields.length() - 1));
    }

输出：

@com.demo.common.FieldDescrib(desc=正常情况是1-100, name=学生的年纪)
@com.demo.common.FieldDescrib(desc=0:未知 1:男 2:女, name=学生的性别)
name:age=20,name:sex=1

可以动态实现一些自定义的功能。